ANKARA, Turkey (AP) - Turkish 10,000-meter runner Elvan Abeylegesse could be stripped of silver medals from the world championships and Olympics after testing positive for steroids in a reanalysis of her doping samples.

The Turkish Athletics Federation says Abeylegesse was among the 28 athletes whose doping samples came back positive in retroactive testing from the 2005 and 2007 world championships.

The federation said the IAAF has asked the 32-year-old Ethiopian-born Abeylegesse to submit her defense concerning test samples from 2007, when she won silver in the 10,000 in Osaka, Japan.

The International Association of Athletics Federations announced Tuesday that 28 athletes had been caught in retests of their samples from the 2005 and 2007 worlds. The IAAF said it had provisionally suspended the athletes, who were not identified.

“I never used such a substance and never even thought about it,” Abeylegesse said. “I am experiencing deep disillusionment and sadness.”

She said she was also asking the IAAF to retest samples from the 2008 Beijing Olympics, where she won silver in the 5,000 and 10,000 meters.

If doping violations are confirmed, medals will be reallocated as necessary, the IAAF said.

If Abeylegesse is stripped of the 2007 silver, U.S. runner Kara Goucher would stand to be bumped up from bronze to silver.

If Abeylegesse loses the Beijing Olympic medals, Shalane Flanagan of the U.S. could be promoted to silver in the 10,000, and Ethiopia’s Meseret Defat moved up to silver in the 5,000.

Zaman newspaper said the Turkish federation dropped Abeylegesse from the national team. It said she can ask for her backup “B” sample to be tested but would be banned for two years if it also comes back positive.